Functionally test force_close with HTTP 1.1 servers
Pulp's downloaders force TCP connection closure with each request even if the remote side indicates it wants to continue the connection. This behavior is what needs to be verified.
To test this I recommend creating an aiohttp server in the test envrionment that will serve an HTTP request with HTTP 1.1 session continuation. It needs to verify that even though the client wants to download at least 2 things, the initial TCP connection is closed and a second one is opened for the second download.